Exchanges prison features inspiring Irish broadcaster (7)

I believe the answer is:

barters

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'exchanges' is the definition.
(I know this)

'prison features inspiring irish broadcaster' is the wordplay.
'prison features' becomes 'bars' (I am not sure about this - if you are sure you should believe this answer much more).
'inspiring' is an insertion indicator.
'irish broadcaster' becomes 'RTE' (national broadcaster of Ireland).
'bars' going around 'rte' is 'BARTERS'.

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I've seen this clue in The Independent.

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